What are the main pest and disease control methods for Chuanxiong (Ligusticum chuanxiong)?

1.Chuanxiong (Ligusticum chuanxiong)Main diseases and control methods

Leaf blight: mostly occurs from May to August. When the disease occurs, brown, irregular spots appear on the leaves, then spread to the entire leaf, causing the leaves of the whole plant to wither and die.

Control methods: In the early stage of the disease, spray with 65% zineb 500-fold solution, or 50% Tuzet 1000-fold solution, or 1:1:100 Bordeaux mixture. Once every 10 days, for 3-4 consecutive times.

Powdery mildew: from late June to September, when temperatures are high and humidity is high, the disease is severe. It starts on the lower leaves, with grayish-white powdery mildew appearing on the leaves and stems, then gradually spreading upward. In the later stage, small black spots appear on the diseased parts, and in severe cases the stems and leaves turn yellow and die.

Control methods: (1) After harvest, clean the field and burn the residual plants and diseased leaves in a centralized manner; (2) In the early stage of the disease, spray with 25% triadimefon 1500-fold solution, or 50% thiophanate-methyl 1000-fold solution, once every 10 days, for 2-3 consecutive sprays.

Rhizome rot: occurs during the growing period and at harvest. The affected rhizome rots internally, turning yellow-brown, watery, with a peculiar odor, and becomes soft-rotted. After being affected during the growing period, the leaves of the aboveground part gradually turn yellow and fall off.

Control methods: (1) Immediately pull out diseased plants after they appear and burn them in a centralized manner to prevent spread; (2) Pay attention to drainage, especially in the rainy season; excessive rain and poor drainage lead to severe disease; (3) During harvest and seed selection, remove diseased "Fuxiong" and already rotted "Lingzi".

2. Main insect pests and control methods

Chuanxiong stem node moth: the larvae bore into the stems, gnaw the node disks, and damage the Lingzi, making them unusable as seed, and in severe cases most of the crop is lost.

Control methods: (1) During the bud cultivation and bud storage period, spray with 80% trichlorfon 1000-1500-fold solution; (2) Before planting, soak the Lingzi in 40% dimethoate 1000-fold solution for 3 hours, then sow.

Qizeng: When found, carry out conventional control, especially from September to October during the peak growth period of the seedlings, control promptly.